I mean we have at least two examples where "as long as you believe, they are willing to give you the power" basically just paraphrases into "You accept us, my way or the highway, or .. maybe you just die." - Xe'ra absolutely tried to force the light on Illidan and Yrel's lightbound in AU Draenor definitely gave everyone and their mother the option to join them, but that doesn't exactly counteract the fact that for everyone not joining up willingly, it was basically a holy crusade approaching, that will either force them or kill them.